There are no zero maintenance apples out there. If you pick apples that have wide range disease resistance you can reduce the work needed. But you still have to deal with insects and animals that eat apples. And you still need to train and prune the trees.
Having said that the maintenance requirements can be pretty low if you choose good cultivar/rootstock combinations, learn a bit about diseases and insects that attack apples, and learn a bit about training trees and pruning.
Disease resistant apples can taste good just like non-disease resistant apples. In fact some of the old heirlooms that have good disease resistance ( many don’t) are among some of the best tasting apples out there.
Take a look at this post and the rest of the thread. It will help you understand how to get good crops and take care of your trees.